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package android.taobao.atlas.startup.patch.releaser;

/**
 * Created by lilong on 16/12/21.
 */
import android.os.Build;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.taobao.atlas.runtime.RuntimeVariables;
import android.taobao.atlas.startup.DexFileCompat;
import android.taobao.atlas.startup.patch.KernalConstants;
import android.util.Log;
import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Method;
import java.util.*;
import java.util.Enumeration;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import dalvik.system.DexFile;

public class BundleReleaser {
    private static final int MSG_ID_DEX_RELEASE_DONE = 1;
    public static final int MSG_ID_DEX_OPT_DONE = 2;
    private static final int MSG_ID_RESOURCE_RELEASE_DONE = 3;
    private static final int MSG_ID_SOLIB_RELEASE_DONE = 4;
    private static final int MSG_ID_RELEASE_DONE = 5;
    private static final int MSG_ID_RELEASE_FAILED = 6;

    private static final String TAG = BundleReleaser.class.getSimpleName();
    private static final String DEX_SUFFIX = ".dex";
    private boolean isReleasing = false;
    private ExecutorService service;
    private File reversionDir;
    private Handler handler;
    private ProcessCallBack processCallBack;
    private File apkFile;
    private boolean hasReleased;
    private boolean externalStorage = false;

    public DexFile[] getDexFile() {
        return dexFiles;
    }

    private DexFile[] dexFiles = null;

    public BundleReleaser(final File reversionDir,boolean hasReleased) {

        this.hasReleased = hasReleased;
        this.reversionDir = reversionDir;
        if(!reversionDir.getAbsolutePath().startsWith(KernalConstants.baseContext.getFilesDir().getAbsolutePath())){
            externalStorage = true;
        }
        if (!(Looper.getMainLooper() == Looper.myLooper())) {
            if (Looper.myLooper() == null)
                Looper.prepare();
        }
        handler = new Handler(new Handler.Callback() {
            @Override
            public boolean handleMessage(Message msg) {
                try {
                    return handleMsg(msg);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                return false;
            }
        });

        this.service = Executors.newFixedThreadPool(3);
    }

    private boolean handleMsg(Message msg) throws IOException {
        switch (msg.what) {
            case MSG_ID_DEX_OPT_DONE:
                isReleasing = false;
                if (processCallBack != null)
                    processCallBack.onFinish(MSG_ID_DEX_OPT_DONE);
                try {
                    release(ReleaseType.RESOURCE);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                return true;
            case MSG_ID_RELEASE_FAILED:
                if (processCallBack != null) {
                    processCallBack.onFailed();
                }

                break;
            case MSG_ID_DEX_RELEASE_DONE:
                if (processCallBack != null) {
                    processCallBack.onFinish(MSG_ID_DEX_RELEASE_DONE);
                }
                dexOptimization();
                return true;

            case MSG_ID_RELEASE_DONE:
                if (processCallBack != null) {
                    processCallBack.onAllFinish();
                }
                return true;

            case MSG_ID_RESOURCE_RELEASE_DONE:
                if (processCallBack != null) {
                    processCallBack.onFinish(MSG_ID_RESOURCE_RELEASE_DONE);
                }
                try {
                    release(ReleaseType.SOLIB);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                break;
            default:
                break;
        }

        return false;
    }


    public void release(final ProcessCallBack processCallBack, final File bundleFile,boolean start) throws IOException {
        Log.e(TAG, "release doing--->" + isReleasing);
        apkFile = bundleFile;
        if (isReleasing) {
            return;
        }
        isReleasing = true;
        this.processCallBack = processCallBack;
        if (!start) {
            release(ReleaseType.DEX);
        }else {
            dexOptimization();
            if (!handler.hasMessages(MSG_ID_RELEASE_FAILED)) {
                processCallBack.onFinish(MSG_ID_DEX_OPT_DONE);
                processCallBack.onAllFinish();
//                handler.removeCallbacksAndMessages(null);
            }else {
                processCallBack.onFailed();
//                handler.removeCallbacksAndMessages(null);
            }
        }
    }


    public void release(final ReleaseType releaseType) throws IOException {
                switch (releaseType) {
                    case DEX:
                        try {
                            Log.e(TAG, "DexReleaser start!");
                            boolean result = DexReleaser.releaseDexes(apkFile, reversionDir,externalStorage);
                            Log.e(TAG, "DexReleaser done!----->"+result);
                            Message message = handler.obtainMessage();
                            if (result) {
                                message.what = MSG_ID_DEX_RELEASE_DONE;
                            } else {
                                message.what = MSG_ID_RELEASE_FAILED;
                            }
                            handler.sendMessage(message);
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                        break;
//                    case RESOURCE:
//                        try {
//                            Log.e(TAG, "ResourceReleaser start!");
//                            boolean result = ResourceReleaser.releaseResource(apkFile, reversionDir);
//                            Log.e(TAG, "ResourceReleaser done!----->"+result);
//
//                            Message message = handler.obtainMessage();
//                            if (result) {
//                                message.what = MSG_ID_RESOURCE_RELEASE_DONE;
//                            } else {
//                                message.what = MSG_ID_RELEASE_FAILED;
//                            }
//                            handler.sendMessage(message);
//                        } catch (IOException e) {
//                            e.printStackTrace();
//                        }
//                        break;
//                    case SOLIB:
//                        try {
//                            Log.e(TAG, "NativeLibReleaser start!");
////                            boolean result = NativeLibReleaser.releaseLibs(apkFile, reversionDir);
//                            Log.e(TAG, "NativeLibReleaser done!----->"+result);
//                            Message message = handler.obtainMessage();
//                            if (result) {
//                                message.what = MSG_ID_RELEASE_DONE;
//                            } else {
//                                message.what = MSG_ID_RELEASE_FAILED;
//                            }
//                            handler.sendMessage(message);
//                        } catch (IOException e) {
//                            e.printStackTrace();
//                        }
//                        break;
                    default:
                        break;

                }

    }

    private void dexOptimization() {
        Log.e(TAG, "dexOptimization start");
        File[] validDexes = reversionDir.listFiles(new FilenameFilter() {
            @Override

            public boolean accept(File dir,String pathname) {
                if (!DexReleaser.isArt() || externalStorage) {
                  return pathname.endsWith(DEX_SUFFIX);
                } else {
                    return pathname.endsWith(".zip");
                }
            }
        });

        File[] rawMainDexZip = reversionDir.listFiles(new FilenameFilter() {
            @Override
            public boolean accept(File dir, String pathname) {
                return pathname.endsWith(".zip");

            }
        });

        if (validDexes!= null && validDexes.length > 0) {
            validDexes = sortDexs(validDexes);
            if (Build.VERSION.SDK_INT >= 21 && Build.VERSION.SDK_INT <= 24) {
                PatchDexProfile.instance(RuntimeVariables.androidApplication).disableJitCompile();
            }
        }else if (rawMainDexZip!= null){

            validDexes = rawMainDexZip;
        }

        dexFiles = new DexFile[validDexes.length];
        if(!hasReleased) {
            Log.e(TAG,"start dexopt | hasRelease : "+hasReleased);
            final CountDownLatch countDownLatch = new CountDownLatch(validDexes.length);
            for (int i = 0; i < validDexes.length; i++) {
                final int j = i;
                final File[] finalValidDexes = validDexes;

                service.submit(new Runnable() {
                    @Override
                    public void run() {
                        dexFiles[j] = dexoptInternal(finalValidDexes[j]);
                        countDownLatch.countDown();
                    }
                });
            }
            try {
                countDownLatch.await();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }else{
            Log.e(TAG,"start dexopt | hasRelease : "+hasReleased);
            for (int i = 0; i < validDexes.length; i++) {
                dexFiles[i] = dexoptInternal(validDexes[i]);
            }
        }

        Log.e(TAG, "dex opt done");
        handler.sendMessage(handler.obtainMessage(MSG_ID_DEX_OPT_DONE));
    }

    private String[] toString(File[] validDexes) {
        String[]ss = new String[validDexes.length];
        for (int i = 0; i < ss.length; i ++){
            ss[i] = validDexes[i].getPath();
        }
        return ss;
    }

    private File[] sortDexs(File[] validDexes) {
        if (validDexes == null){
            return validDexes;
        }else {
           List<File>files = Arrays.asList(validDexes);
           Collections.sort(files, new Comparator<File>() {
               @Override
               public int compare(File lhs, File rhs) {
                   if (lhs.getName().equals("classes.dex")) {
                       return -1;
                   } else if (rhs.getName().equals("classes.dex")) {
                       return 1;
                   }
                   return Integer.valueOf(lhs.getName().substring(7, lhs.getName().indexOf("."))) - Integer.valueOf(rhs.getName().substring(7, rhs.getName().indexOf(".")));
               }
           });
           return files.toArray(new File[0]);
        }

    }

    private DexFile dexoptInternal(File validDex){
        long startTime = System.currentTimeMillis();
        DexFile dexFile = null;
        String optimizedPath = optimizedPathFor(validDex, dexOptDir());
        try {
            if(!externalStorage) {

                if(!new File(optimizedPath).exists()){
                    Log.e(TAG,"odex not exist");
                }
            }else{
                //interpretOnly
                if(Build.VERSION.SDK_INT>=21 && isVMMultidexCapable(System.getProperty("java.vm.version"))) {
                    optimizedPath = KernalConstants.baseContext.getFilesDir()+File.separator+"fake.dex";
                    new File(optimizedPath).createNewFile();
                    dexFile = DexFileCompat.loadDex(KernalConstants.baseContext, validDex.getPath(), optimizedPath, 0);
                }else{
                    dexFile = DexFileCompat.loadDex(KernalConstants.baseContext,validDex.getPath(), optimizedPath,0);
                }
            }
            boolean result = verifyDexFile(dexFile,optimizedPath);
            if (!result) {
                
                handler.sendMessage(handler.obtainMessage(MSG_ID_RELEASE_FAILED));
            }else {
                Log.e(TAG,"oat length:"+String.valueOf(new File(optimizedPath).length()));
            }
        } catch (Exception e) {
            e.printStackTrace();
            handler.sendMessage(handler.obtainMessage(MSG_ID_RELEASE_FAILED));
        } finally {
            Log.e(TAG, String.format("dex %s consume %d ms", validDex.getAbsolutePath(),
                    System.currentTimeMillis() - startTime));
        }
        return dexFile;
    }

    private boolean verifyDexFile(DexFile dexFile,String optimizedPath) throws IOException {
        if (dexFile != null) {
            if(externalStorage){
                return true;
            }
            if (!checkDexValid(dexFile)) {
                return false;
            }

            return true;
        }
        return false;
    }

    public boolean checkDexValid(DexFile odexFile) throws IOException {
        if (DexReleaser.isArt()) {
            String applicationName = KernalConstants.RAW_APPLICATION_NAME;
            try {
                Enumeration<String> enumeration = odexFile.entries();
                while (enumeration.hasMoreElements()) {
                    if (enumeration.nextElement().replace("/", ".").equals(applicationName)) {
                        return true;
                    }
                }
                return false;
            } catch (Throwable e) {
                e.printStackTrace();
                return false;
            }
        }
        return true;
    }


    private String optimizedPathFor(File path, File optimizedDirectory) {
        String fileName = path.getName();
        if (!fileName.endsWith(DEX_SUFFIX)) {
            int lastDot = fileName.lastIndexOf(".");
            if (lastDot < 0) {
                fileName += DEX_SUFFIX;
            } else {
                StringBuilder sb = new StringBuilder(lastDot + 4);
                sb.append(fileName, 0, lastDot);
                sb.append(DEX_SUFFIX);
                fileName = sb.toString();
            }
        }
        File result = new File(optimizedDirectory, fileName);
        return result.getPath();

    }

    private File dexOptDir() {
        File optDir = new File(reversionDir, "opt");
        if (!optDir.exists()){
            optDir.mkdirs();
        }
        return optDir;
    }

    public void close(){
        if (!(Looper.getMainLooper() == Looper.myLooper())){
            Looper.myLooper().quit();
        }
        handler.removeCallbacksAndMessages(null);
        handler = null;
        service.shutdown();
    }

    /**
     * Identifies if the current VM has a native support for multidex, meaning there is no need for
     * additional installation by this library.
     * @return true if the VM handles multidex
     */
    /* package visible for test */
    static boolean isVMMultidexCapable(String versionString) {
        boolean isMultidexCapable = false;
        if (versionString != null) {
            Matcher matcher = Pattern.compile("(\\d+)\\.(\\d+)(\\.\\d+)?").matcher(versionString);
            if (matcher.matches()) {
                try {
                    int major = Integer.parseInt(matcher.group(1));
                    int minor = Integer.parseInt(matcher.group(2));
                    isMultidexCapable = (major > 2)
                            || ((major == 2)
                            && (minor >= 1));
                } catch (NumberFormatException e) {
                    // let isMultidexCapable be false
                }
            }
        }
        Log.i(TAG, "VM with version " + versionString +
                (isMultidexCapable ?
                        " has multidex support" :
                        " does not have multidex support"));
        return isMultidexCapable;
    }


    private void dexOat(String dexFilePath,String oatFilePath,String targetISA) throws IOException, InterruptedException {
        final List<String> commandAndParams = new ArrayList<>();
        commandAndParams.add("dex2oat");
        if (Build.VERSION.SDK_INT >= 24) {
            commandAndParams.add("--runtime-arg");
            commandAndParams.add("-classpath");
            commandAndParams.add("--runtime-arg");
            commandAndParams.add("&");
        }
        commandAndParams.add("--dex-file=" + dexFilePath);
        commandAndParams.add("--oat-file=" + oatFilePath);
        commandAndParams.add("--instruction-set=" + targetISA);
        if (Build.VERSION.SDK_INT > 25) {
            commandAndParams.add("--compiler-filter=quicken");
        } else {
            commandAndParams.add("--compiler-filter=interpret-only");
        }
        final ProcessBuilder pb = new ProcessBuilder(commandAndParams);
        pb.redirectErrorStream(true);
        final Process dex2oatProcess = pb.start();
        StreamConsumer.consumeInputStream(dex2oatProcess.getInputStream());
        StreamConsumer.consumeInputStream(dex2oatProcess.getErrorStream());
            final int ret = dex2oatProcess.waitFor();
            if (ret != 0) {
                throw new IOException("dex2oat works unsuccessfully, exit code: " + ret);
            }

    }

    public interface ProcessCallBack{

        void onFailed() throws IOException;

        void onFinish(int event);

        void onAllFinish();

    }

    private static class StreamConsumer {
        static final Executor STREAM_CONSUMER = Executors.newSingleThreadExecutor();

        static void consumeInputStream(final InputStream is) {
            STREAM_CONSUMER.execute(new Runnable() {
                @Override
                public void run() {
                    if (is == null) {
                        return;
                    }
                    final byte[] buffer = new byte[256];
                    try {
                        while ((is.read(buffer)) > 0) {
                            // To satisfy checkstyle rules.
                        }
                    } catch (IOException ignored) {
                        // Ignored.
                    } finally {
                        try {
                            is.close();
                        } catch (Exception ignored) {
                            // Ignored.
                        }
                    }
                }
            });
        }
    }

    public static String getCurrentInstructionSet() throws Exception {
        String currentInstructionSet = null;
        if (currentInstructionSet != null) {
            return currentInstructionSet;
        }
        Class<?> clazz = Class.forName("dalvik.system.VMRuntime");
        Method currentGet = clazz.getDeclaredMethod("getCurrentInstructionSet");

        currentInstructionSet = (String) currentGet.invoke(null);
        Log.d(TAG, "getCurrentInstructionSet:" + currentInstructionSet);
        return currentInstructionSet;
    }


}